National Stock Number
4240-01-029-0438
National Stock Number (NSN) 4240-01-029-0438, or NIIN 010290438, (filter element set,chemical-biological mask) has an unknown assigned date. NIIN 010290438 was cancelled on May 20, 1997, with a cancelled status of "Item is Cancelled - Inactive." There is no known replacement specified for this stock number. This NSN does not replace any other NSNs.
There are no manufacturer part numbers associated to this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 31523. [AIR FILTERING DEVICES, ESPECIALLY DESIGNED TO BE INSERTED IN THE FACEPIECE OF THE MASK. THE FILTERS REMOVE FROM THE AIR PASSING THROUGH THEM TOXIC AND/OR IRRITATING CHEMICAL VAPORS, GASES, AND PARTICULATE CONTAMINANTS (DUSTS, FUMES, MISTS, FOGS, AND SMOKE), INCLUDING BIOLOGICAL ORGANISMS LIKELY TO BE USED IN WARFARE. THEY MAY FILTER INDUSTRIAL DUSTS, FUMES, MISTS, FOGS, AND SMOKE, BUT ARE NOT DESIGNED TO REMOVE INDUSTRIAL TYPE GASES OR VAPORS.]. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 4240010290438 contains an unknown precious metal.
This information was last updated on Jul 01, 2025.